401521036 has 48 divisors (see below), whose sum is σ = 825636672. Its totient is φ = 167270400.

The previous prime is 401521033. The next prime is 401521039. The reversal of 401521036 is 630125104.

It is an interprime number because it is at equal distance from previous prime (401521033) and next prime (401521039).

It is a super-2 number, since 2×401521036² = 322438284701026592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401520998 and 401521016.

It is not an unprimeable number, because it can be changed into a prime (401521033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 455316 + ... + 456196.

It is an arithmetic number, because the mean of its divisors is an integer number (17200764).

Almost surely, 2^401521036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401521036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412818336).

401521036 is an abundant number, since it is smaller than the sum of its proper divisors (424115636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401521036 is a wasteful number, since it uses less digits than its factorization.

401521036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330 (or 1328 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 401521036 is about 20037.9898193407. The cubic root of 401521036 is about 737.7390425348.

The spelling of 401521036 in words is "four hundred one million, five hundred twenty-one thousand, thirty-six".